File:  [Qemu by Fabrice Bellard] / qemu / oslib-posix.c
Revision 1.1.1.1 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 18:34:19 2018 UTC (3 years, 4 months ago) by root
Branches: qemu, MAIN
CVS tags: qemu0150, qemu0141, qemu0140, HEAD
qemu 0.14.0

    1: /*
    2:  * os-posix-lib.c
    3:  *
    4:  * Copyright (c) 2003-2008 Fabrice Bellard
    5:  * Copyright (c) 2010 Red Hat, Inc.
    6:  *
    7:  * QEMU library functions on POSIX which are shared between QEMU and
    8:  * the QEMU tools.
    9:  *
   10:  * Permission is hereby granted, free of charge, to any person obtaining a copy
   11:  * of this software and associated documentation files (the "Software"), to deal
   12:  * in the Software without restriction, including without limitation the rights
   13:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   14:  * copies of the Software, and to permit persons to whom the Software is
   15:  * furnished to do so, subject to the following conditions:
   16:  *
   17:  * The above copyright notice and this permission notice shall be included in
   18:  * all copies or substantial portions of the Software.
   19:  *
   20:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   21:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   22:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
   23:  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   24:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   25:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   26:  * THE SOFTWARE.
   27:  */
   28: 
   29: #include "config-host.h"
   30: #include "sysemu.h"
   31: #include "trace.h"
   32: #include "qemu_socket.h"
   33: 
   34: void *qemu_oom_check(void *ptr)
   35: {
   36:     if (ptr == NULL) {
   37:         fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
   38:         abort();
   39:     }
   40:     return ptr;
   41: }
   42: 
   43: void *qemu_memalign(size_t alignment, size_t size)
   44: {
   45:     void *ptr;
   46: #if defined(_POSIX_C_SOURCE) && !defined(__sun__)
   47:     int ret;
   48:     ret = posix_memalign(&ptr, alignment, size);
   49:     if (ret != 0) {
   50:         fprintf(stderr, "Failed to allocate %zu B: %s\n",
   51:                 size, strerror(ret));
   52:         abort();
   53:     }
   54: #elif defined(CONFIG_BSD)
   55:     ptr = qemu_oom_check(valloc(size));
   56: #else
   57:     ptr = qemu_oom_check(memalign(alignment, size));
   58: #endif
   59:     trace_qemu_memalign(alignment, size, ptr);
   60:     return ptr;
   61: }
   62: 
   63: /* alloc shared memory pages */
   64: void *qemu_vmalloc(size_t size)
   65: {
   66:     return qemu_memalign(getpagesize(), size);
   67: }
   68: 
   69: void qemu_vfree(void *ptr)
   70: {
   71:     trace_qemu_vfree(ptr);
   72:     free(ptr);
   73: }
   74: 
   75: void socket_set_nonblock(int fd)
   76: {
   77:     int f;
   78:     f = fcntl(fd, F_GETFL);
   79:     fcntl(fd, F_SETFL, f | O_NONBLOCK);
   80: }
   81: 
   82: void qemu_set_cloexec(int fd)
   83: {
   84:     int f;
   85:     f = fcntl(fd, F_GETFD);
   86:     fcntl(fd, F_SETFD, f | FD_CLOEXEC);
   87: }
   88: 
   89: /*
   90:  * Creates a pipe with FD_CLOEXEC set on both file descriptors
   91:  */
   92: int qemu_pipe(int pipefd[2])
   93: {
   94:     int ret;
   95: 
   96: #ifdef CONFIG_PIPE2
   97:     ret = pipe2(pipefd, O_CLOEXEC);
   98:     if (ret != -1 || errno != ENOSYS) {
   99:         return ret;
  100:     }
  101: #endif
  102:     ret = pipe(pipefd);
  103:     if (ret == 0) {
  104:         qemu_set_cloexec(pipefd[0]);
  105:         qemu_set_cloexec(pipefd[1]);
  106:     }
  107: 
  108:     return ret;
  109: }
  110: 
  111: int qemu_utimensat(int dirfd, const char *path, const struct timespec *times,
  112:                    int flags)
  113: {
  114:     struct timeval tv[2], tv_now;
  115:     struct stat st;
  116:     int i;
  117: #ifdef CONFIG_UTIMENSAT
  118:     int ret;
  119: 
  120:     ret = utimensat(dirfd, path, times, flags);
  121:     if (ret != -1 || errno != ENOSYS) {
  122:         return ret;
  123:     }
  124: #endif
  125:     /* Fallback: use utimes() instead of utimensat() */
  126: 
  127:     /* happy if special cases */
  128:     if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) {
  129:         return 0;
  130:     }
  131:     if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) {
  132:         return utimes(path, NULL);
  133:     }
  134: 
  135:     /* prepare for hard cases */
  136:     if (times[0].tv_nsec == UTIME_NOW || times[1].tv_nsec == UTIME_NOW) {
  137:         gettimeofday(&tv_now, NULL);
  138:     }
  139:     if (times[0].tv_nsec == UTIME_OMIT || times[1].tv_nsec == UTIME_OMIT) {
  140:         stat(path, &st);
  141:     }
  142: 
  143:     for (i = 0; i < 2; i++) {
  144:         if (times[i].tv_nsec == UTIME_NOW) {
  145:             tv[i].tv_sec = tv_now.tv_sec;
  146:             tv[i].tv_usec = tv_now.tv_usec;
  147:         } else if (times[i].tv_nsec == UTIME_OMIT) {
  148:             tv[i].tv_sec = (i == 0) ? st.st_atime : st.st_mtime;
  149:             tv[i].tv_usec = 0;
  150:         } else {
  151:             tv[i].tv_sec = times[i].tv_sec;
  152:             tv[i].tv_usec = times[i].tv_nsec / 1000;
  153:         }
  154:     }
  155: 
  156:     return utimes(path, &tv[0]);
  157: }

unix.superglobalmegacorp.com